Power Flow System Extractor Exhaust System Installation Instructions Cessna 172, 175 TABLE OF CONTENTS

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2 Heading Power Flow System Extractor Exhaust System Installation Instructions TABLE OF CONTENTS Pages Introduction 3 Kit Contents Classic Tailpipes 4 Kit Contents Short Stack Tailpipes 5 Preparation 6 Removal of old exhaust system 6 Installation 6 Installing Collector Box Assembly and Exhaust Assembly 6 Detail A 7 Detail B 8 CLASSIC TAILIPES Installing Support Rod P/N Installing Exhaust Extension and Muffler 10 Installation Overview (PFS-13204) 11 Passenger Side View (PFS-13204) 12 Pilot Side View (PFS-13204) 13 Rear View (PFS-13204) 14 Detail C 15 Detail D 16 SHORT STACK TAILIPES Installing Tailpipe 17 Installation Overview (PFS Short Stack Tailpipe) 18 Passenger Side View (PFS Short Stack Tailpipe) 19 Pilot Side View (PFS Short Stack Tailpipe) 20 Rear View (PFS Short Stack Tailpipe) 21 Instructions for Continued Airworthiness 22 STC 25 PFS Rev F Page 2 of 24 May 21, 2007

3 Introduction NOTE: If your cowling has been modified at all to be different than when it was originally built, please ensure our modification will be compatible before installation or flying. Description: The PFS exhaust consists of an exhaust pipe from each cylinder to the collector assembly located beneath the engine. The collector assembly is enclosed in a shroud, which captures ram air to be heated by exhaust gases passing through the tubes of the collector assembly. This heated air is used to heat the aircraft cabin. A separate compartment of the collector assembly furnishes heated air for carburetor heat (carbureted engines only). A detachable tailpipe from the collector assembly routes exhaust gases to a muffler through an opening in the lower cowling. A support rod attached to the lower right engine mount supports the muffler on kits supplied with classic tailpipes. Customers with classic tailpipes please note: Carbon Monoxide testing was performed with the muffler positioned as described in these instructions. Repositioning the muffler and/or support rod may cause carbon monoxide to enter the aircraft cabin. Note: PFS is the abbreviation for Power Flow Systems. Please read these directions completely before starting installation. Please call us at during normal business hours if you have any questions regarding the installation of this kit. Please Note: The Power Flow Systems Exhaust has been designed and FAA certified to be installed in accordance with these instructions. Any modification to the exhaust system or its components, or any deviation from these instructions without express written permission from Power Flow Systems, Inc. invalidates the design and the FAA approval. Any such modifications or deviations will also void the exhaust system warranty. PFS Rev F Page 3 of 24 May 21, 2007

4 Kit Contents Kits Shipped with Classic Tailpipes Each Power Flow exhaust kit is shipped with: Quantity Part Description Cessna 172R,S 1 #1 Header Same 1 #2 Header 12600** Same 1 #3 Header Same 1 #4 Header 14600** Same 4 No-blow Header Gasket 77611* Same 8 Exhaust Nut SL-STD-1410* Same 8 Lock Washer MS * Same 8 Plain Washer AN * Same 1 Shrouded Collector Assembly Exhaust Extension Assembly Same 2 Exhaust Clamp (2 with pin) 7020 Same 3 Drilled Bolt AN4C5* Same 3 Castle Nut AN310C4* Same 3 Cotter Pin MS * Same 8 Flat Washer AN960C416* Same 1 Adel Clamp size 6 MS21919WH6* Same 1 Adel Clamp size 12 MS21919WH12* Same 1 Locknut MS21044C3* Same 1 Bolt MS * Same 2 Flat Washer AN960C10 Same 1 Muffler Assembly Same 1 Support Rod Same 1 Muffler Clamp (3 1/2 without pin) 8030 Same 42 Scat Tubing SCAT-12* Same *Please note that equivalent hardware may be supplied. **Aircraft with O320 Engines will receive and headers. PFS Rev F Page 4 of 24 May 21, 2007

5 Kit Contents Kits Shipped with Short Stack Tailpipes Each Power Flow exhaust kit is shipped with: Quantity Part Description Cessna 172R,S 1 #1 Header Same 1 #2 Header 12600** Same 1 #3 Header Same 1 #4 Header 14600** Same 4 No-blow Header Gasket 77611* Same 8 Exhaust Nut SL-STD-1410* Same 8 Lock Washer MS * Same 8 Plain Washer AN * Same 1 Shrouded Collector Assembly Short Stack Tailpipe Assembly Same 1 Exhaust Clamp (2 with pin) 7020 Same 1 Drilled Bolt AN4C5* Same 1 Castle Nut AN310C4* Same 1 Cotter Pin MS * Same 2 Flat Washer AN960C416* Same 42 Scat Tubing SCAT-12* Same *Please note that equivalent hardware may be supplied. **Aircraft with O320 Engines will receive and headers. PFS Rev F Page 5 of 24 May 21, 2007

6 PREPARATION REMOVAL OF OLD EXHAUST SYSTEM 1) Remove lower cowl components in accordance with the latest approved revision of the Aircraft Service Manual. 2) Disconnect flexible ducts from muffler assembly. 3) Remove EGT probe(s), if installed. 4) Cover heat carb inlet to prevent debris from entering the carburetor (if applicable). 5) Remove nuts attaching exhaust pipes to exhaust studs. 6) Remove exhaust pipes and exhaust gaskets. INSTALLATION NOTE: Our Carburetor heat adapter is designed to accept 2 common sizes of SCAT hose. If your hose is large (2.5 diameter), cut off and deburr the reducer portion of the adapter. (Not applicable to fuel injected engines). A. Installing Collector Box assembly and Exhaust pipes: Please note that both collector styles, and 41723, are installed in the same manner. 1) Insert the number 1 and number 3 exhaust header pipes into the collector assembly as per the numbering on the collector and headers. Be sure to use the alignment marks. A minimum of 1 ½ penetration is required for proper operation. Put new gaskets into position on each cylinder. It is suggested that you keep them in place temporarily with either a loop of safety wire or a large cotter pin. Lift and hold the assembly into position; be sure the shroud inlet tube passes cleanly through the front baffle. Start a nut on each header to hold the entire assembly in place. See Detail A, Passenger and Pilot Side Views. 2) Insert the number 2 and number 4 header pipes into the collector assembly as per the numbering on the collector and headers. Be sure to use the alignment marks. A minimum of 1 1/2 penetration is required for proper operation. Be sure to use the new gaskets provided. 3) Install a washer, a lock washer and a nut on each stud (there are 8 sets of these). If utilized, remove the loops of safety wire or cotter pins. Torque I.A.W. the latest revision of the aircraft or engine service manual. See Detail A and Pilot Side View. 4) Install EGT Probes (If Applicable) I.A.W. the manufacturer s recommendations. All probes should be the same distance from the port, typically 2-4 inches. 5) Install flexible tubing to shroud connections. The cabin heat outlet is on the aft-pilot side of the shroud (PN and PN 41723). PN has a carb heat outlet on the passenger side of the shroud. PN does not have a carb heat outlet. PFS Rev F Page 6 of 24 May 21, 2007

7 Equivalent Hardware May Be Supplied. PFS Rev F Page 7 of 24 May 21, 2007

8 DETAIL B PFS Rev F Page 8 of 24 May 21, 2007

9 CLASSIC TAILPIPE INSTALLATION If your exhaust has a Short Stack Tailpipe, Please Skip to Page 17 B. Installing Support Rod P/N 90020: 1) Examine the right lower engine mount bolt and nut. If you have one to two threads showing at the nut, it may be necessary to install the next dash number longer AN7 bolt after installing our support rod adapter. See Detail D. a) Loosen and remove the lower right engine Lord mount bolt. Our support rod adapter (the teardrop shaped piece of metal welded to the support rod) goes under the bolt head, on top of the existing large area washer. This large area washer may be omitted if the bolt is too short. See Detail D. Ensure that the rod clears all engine compartment parts, and will exit the cowl well forward of the firewall, slightly outboard of the engine lord mount and directly above the muffler assembly (The muffler, PN can be temporarily installed onto exhaust extension PN to check this alignment). Also make sure that the end of the support rod will clear the bottom of the aircraft cowl. b) Tighten the Lord mount bolt, but DO NOT TORQUE TO VALUE YET. You will fully torque the mount once the position and adjustment of the support rod is complete. c) Using the Adel clamps provided, secure the support rod to the engine mount. MODIFYING THIS SUPPORT ROD OR FABRICATING ADDITIONAL SUPPORT MAY CAUSE PARTS TO FAIL AND WILL VOID YOUR WARRANTY. 2) Place the included template of the lower cowling according to the instructions on the template. Cut out the hole as indicated. If the template doesn t fit, or if you have any questions regarding this cut, please call for assistance before cutting hole. 3) Slide the exhaust extension PN: onto the end of the 4-to-1 collector. DO NOT drill for clamp installation, yet. 4) Position the lower cowl onto the airplane. Attach the cowl with enough screws to ensure the proper angle of the cowl. The support rod should pass cleanly through the hole drilled through the cowl, and the exhaust extension should pass through the middle of the stock exhaust outlet. It may be necessary to temporarily attach the upper cowl to attain the proper cowling angle. 5) Slide the muffler assembly, P/N 80010, over the exhaust extension outlet. It should be pushed up as far it can go, oriented straight back. The support rod should be contacting the muffler. You may have to make minor adjustments in alignment and rotation of both the muffler assembly and the exhaust extension assembly. Any deviation in muffler and/or support rod alignment may cause carbon monoxide to enter the aircraft cabin. The muffler must be pointed down and away from the aircraft not parallel to the fuselage in order to ensure that no exhaust gases enter the aircraft cabin. 6) Position the large clamp, P/N 8030, around the muffler so that it will attach to the support rod. 7) If a nosepant is installed, turn the nose gear fully to the left and ensure that the muffler assembly does NOT strike the pant. If needed, rotate the muffler outward. The support rod can be carefully bent to assist in assuring that the support rod and muffler clamp stay in alignment. If the end tab does not align flat against the clamp, twist the tab with pliers until it lays flat. PFS Rev F Page 9 of 24 May 21, 2007

10 Warning: Fuel strainer outlet must be redirected so that it does not spray fuel on tailpipe during fuel strainer drain operation. C. Installing Exhaust Extension and Muffler 1) Install the large clamp (without the pin) so that the holes will align with the hole in the support rod. See Detail C. 2) Drill a 0.25 hole through the pilot hole in the muffler through the exhaust extension. 3) Remove the muffler. 4) Remove the lower cowl. 5) Reattach the muffler and temporarily install the large clamp. 6) Drill a 0.25 hole through the flared end of the exhaust extension, about one inch from the end of the flare. Drill through the exhaust extension and the 4 to 1 collector. Be sure to de-burr all the holes or later removal of muffler components will be difficult. 7) Clamp the exhaust extension to the 4 to 1 using one of the provided 2 clamps (PN 7020). See Detail B. The pin should insert with minimal force. If any binding exists, the hole may need further reaming. 8) Remove the muffler and re-install the lower cowl. Install the muffler assembly and clamp to the exhaust extension with the other 2 clamp. See Detail B. Again, if the pin is a tight fit, further reaming of the hole may be necessary. 9) Clamp the muffler assembly to the support rod with the provided 3.5 clamp. See Detail C. 10) Now that all of the support mechanism for the muffler is correct, tighten the engine mount to manufacturer s specified torque. Be sure that the support rod doesn t rotate when tightening. 11) Depending on your aircraft, it may be necessary to slightly increase the size of the tailpipe opening in the cowling. Some aircraft with engine conversions may require more clearance on the outboard side of the tailpipe. If this is necessary, a doubler may be installed to cover some of the excessive opening on the inboard side of the tailpipe. CAUTION Make sure that you have at least one to two threads showing through the nut on the engine mount. It may be necessary to install a longer bolt. Any deviation in muffler and/or support rod alignment may cause carbon monoxide to enter the aircraft cabin. The muffler must be pointed down and away from the aircraft not parallel to the fuselage in order to ensure that no exhaust gases enter the aircraft cabin. Create a placard and place in clear view of the pilot that reads: The Power Flow Systems, Inc. tuned exhaust system installed on this aircraft may cause the aircraft to burn more fuel at certain power settings. It is the Pilot s responsibility to determine what, if any, change in fuel flow exists and to plan accordingly. Make appropriate entries in the logbook and on FAA Form 337. The STC is located at the back of this instruction set for easy removal. - Typical Weight and Balance Information: The Power Flow Systems, Inc. tuned exhaust system with the classic tailpipe weighs approximately 24lbs at station Since the weight of stock exhaust systems can vary, it is recommended that the installer weigh both the stock and Power Flow systems for an exact differential PFS Rev F Page 10 of 24 May 21, 2007

11 PFS with Classic Tailpipe Shown PFS Rev F Page 11 of 24 May 21, 2007

12 PFS with Classic Tailpipe Shown PFS Rev F Page 12 of 24 May 21, 2007

13 PFS with Classic Tailpipe Shown PFS Rev F Page 13 of 24 May 21, 2007

14 PFS with Classic Tailpipe Shown PFS Rev F Page 14 of 24 May 21, 2007

15 DETAIL C PFS Rev F Page 15 of 24 May 21, 2007

16 PFS Rev F Page 16 of 24 May 21, 2007

17 SHORT STACK TAILPIPE INSTALLATION If your exhaust has a Classic Tailpipe, Please Return to Page 9 or Skip to Page 22 for Instructions for Continued Airworthiness 1) Slide the tailpipe, PN onto the end of the 4-to-1 collector. DO NOT drill for clamp installation, yet. 2) Position the lower cowl onto the airplane. Attach the cowl with enough screws to ensure the proper angle of the cowl (please note that the lower cowl may sag without the top cowl installed, for best results, we recommend installing the top cowl). The tailpipe should pass cleanly through the exhaust pipe opening. The pipe should be angled slightly outboard and slightly aft, just like the stock exhaust tailpipe. 3) Depending on your aircraft, it may be necessary to slightly increase the size of the tailpipe opening in the cowling. Some aircraft with engine conversions may require more clearance on the outboard side of the tailpipe. If this is necessary, a doubler may be installed to cover some of the excessive opening on the inboard side of the tailpipe. 4) Mark the junction of the slip joint to indicate the proper rotation angle. 5) Remove the cowling. 6) Drill a 0.25 hole through the flared end of the tailpipe, about one inch from the end of the flare. 7) Install clamp PN 7020 using provided hardware. See Detail B. The pin should insert with no more than moderate hand pressure. If binding exists the hole may need further reaming. Create a placard and place in clear view of the pilot that reads: The Power Flow Systems, Inc. tuned exhaust system installed on this aircraft may cause the aircraft to burn more fuel at certain power settings. It is the Pilot s responsibility to determine what, if any, change in fuel flow exists and to plan accordingly. Make appropriate entries in the logbook and on FAA Form 337. The STC is located at the back of this instruction set for easy removal. - Typical Weight and Balance Information: The Power Flow Systems, Inc. tuned exhaust system with the short stack tailpipe weighs approximately 22lbs at station Since the weight of stock exhaust systems can vary, it is recommended that the installer weigh both the stock and Power Flow systems for an exact differential. PFS Rev F Page 17 of 24 May 21, 2007

18 SHORTSTACK TAILPIPE PFS Rev F Page 18 of 24 May 21, 2007

19 SHORT STACK PFS Rev F Page 19 of 24 May 21, 2007

20 SHORT STACK PFS Rev F Page 20 of 24 May 21, 2007

21 SHORT STACK PFS Rev F Page 21 of 24 May 21, 2007

22 INSTRUCTIONS FOR CONTINUED AIRWORTHINESS It is the responsibility of the aircraft owner/technician to ensure that the most recent revision of these instructions is followed. The most recent revision of this report can obtained by calling Power Flow Systems, Inc. at (386) or online at BASIC OPERATION Basic operation of the airplane remains the same. The pilot must watch to ensure that redline of the RPM is not exceeded. 2.0 AIRWORTHINESS LIMITATIONS The Airworthiness Limitations section is FAA approved and specifies maintenance required under and of the Federal Aviation Regulations unless an alternative program has been FAA approved. 2.1 Mandatory Replacement Time None 2.2 Structural Inspection Interval At 100 hour or Annual intervals, depending on the service regime of the aircraft. 2.3 Structural Inspection Procedure See Section 5.0 Below. 3.0 TROUBLESHOOTING Problem Possible Cause Solution Exhaust smell in cockpit Exhaust Leak Inspect exhaust system for leaks Excessive vibration Excessive noise Collector not centered on header pipes Propeller not properly balanced Muffler insert damaged or missing Reposition collector -- ensure minimum of 1 ½ Penetration per header into central collector system Have propeller balanced Contact PFS, Inc. for new muffler insert 4.0 MAXIMIZING SERVICE LIFE To get the maximum possible service life from your Power Flow Systems Tuned Exhaust, follow the following steps. 4.1 Dynamically balance your propeller to below 0.2 ips (inches per second) every 2 years or 1000 hours (whichever occurs first). 4.2 Dynamically balance your propeller to below 0.2 ips after modifying, overhauling, dressing, or replacing any rotating component on the engine or propeller. 4.3 Keep slip joints lubricated with a high temperature anti-seize. 4.4 Maintain even engine compressions above 70/80 psi. 4.5 Keep magnetos in good working order and ensure that mag drops are even and less than the maximum recommended by the aircraft manufacture. PFS Rev F Page 22 of 24 May 21, 2007

23 PLEASE NOTE THAT FAILURE TO COMPLY WITH ONE OR MORE OF THESE STEPS MAY IMPACT THE PRODUCT WARRANTY. PLEASE CONSULT YOUR WARRANTY DOCUMENTATION FOR FURTHER DETAILS. 5.0 REMOVAL Classic Tailpipe: 1. Disconnect muffler support rod P/N from muffler clamp P/N Disconnect exhaust clamp P/N 7020 and remove muffler assembly P/N from exhaust extension P/N Classic and Short stack Tailpipes: 3. Remove lower cowl IAW the latest FAA approved revision of the Aircraft Service Manual 4. Disconnect flexible ducts from collector assembly 5. Remove EGT probes if installed. 6. Remove exhaust pipes from cylinders 2 and 4 and separate them from the collector assembly. 7. Remove the collector assembly by pulling out from the 1 and 3 cylinder side. 8. Remove the 1 & 3 headers 9. Remove the engine mount bolt and support rod if necessary (classic tailpipe only). 6.0 INSPECTION The exhaust system must be thoroughly inspected, especially within the heat exchanger section. A detailed inspection of the exhaust system must be performed in accordance with the latest revision of the Aircraft Service Manual at either 100 hour or annual intervals. All components displaying cracking or general deterioration must be replaced with new parts or repaired in accordance with AC or the latest approved revision. A. Exhaust Installed 1. Remove engine cowling 2. Loosen and remove shrouds so that all surfaces of the exhaust system are visible 3. Check for holes, cracks, and burned spots. Especially check areas adjacent to welds. Look for exhaust gas deposits in surrounding areas. This may indicate an exhaust leak. 4. Inspect the baffling in the tailpipe. If the baffling is missing or deteriorated, it will require replacement. New baffling inserts are available from Power Flow Systems, Inc. 5. Inspect the ball joint for freedom of movement (classic tailpipes only). A seized ball joint may cause other components to crack. If penetrating lube won t free a seized ball joint, please contact Power Flow Systems, Inc. for a replacement. 6. Inspect screen covering carb heat outlet. Screens must be secure with no risk of material breaking off. 7. Inspect pins on clamps. Pins should not indicate excessive wear or cutting. If worn or cut contact Power Flow Systems, Inc. for replacement. 8. Inspect holes that pins are inserted in for elongation. If elongated contact Power Flow Systems, Inc. for a replacement. PFS Rev F Page 23 of 24 May 21, 2007

24 9. Ensure Placard is visible to pilot that states The Power Flow Systems, Inc. tuned exhaust system installed on this aircraft may cause the aircraft to burn more fuel at certain power settings. It is the Pilot s responsibility to determine what, if any, change in fuel flow exists and to plan accordingly. B. Exhaust Removed If any defects (cracks, burns, etc.) on the collector assembly (other than on the shroud) are noted during the visual inspection, then the collector needs to be pressure tested using the procedure below: 1. Remove exhaust pipes and heat exchanger assembly. 2. All slip joints must be disassembled and lubricated with a high-temperature anti-seize compound. (Only necessary at 500hr or annual intervals, whichever comes first). This should be performed more frequently if headers seize between inspections. While disassembled, inspect for wear or galling. 3. Remove shrouds. 4. Seal openings with expansion rubber plugs. 5. Submerge the collector assembly in water. 6. Using a manometer or pressure gauge, apply 3.0 to 3.5 PSI (approximately 7 Hg) of air pressure. 7. Let the unit sit pressurized for 10 to 30 seconds. The leak rate should be zero. 8. If a leak is found in the collector assembly, replace or repair before further flight. 9. If no leaks are found, dry components and install on airplane. All components displaying cracking or general deterioration must be replaced with new parts or repaired in accordance with AC or the latest approved revision. PFS Rev F Page 24 of 24 May 21, 2007

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